SELECT 
  f.feature_id, 
  f.purpose, 
  p.product_id, 
  p.parent_product_id, 
  g.id, 
  g.code 
FROM 
  cscart_product_variation_group_features AS f 
  INNER JOIN cscart_product_variation_groups AS g ON f.group_id = g.id 
  INNER JOIN cscart_product_variation_group_products AS p ON f.group_id = p.group_id 
WHERE 
  p.product_id IN (
    451454, 436557, 436005, 422676, 427654, 
    406498, 438920, 440047, 403424, 402161, 
    426357, 413770, 421856, 453293, 421836, 
    444708, 429476, 413127, 407471, 409966, 
    403355, 408795, 420652, 443583, 442532, 
    408975, 443876, 402463, 438541, 427151, 
    454935, 437239, 452456, 406327, 412758, 
    433230, 415021, 414349, 430686, 451899, 
    423535, 431133, 406624, 460023, 459938, 
    403250, 403839, 442555
  )

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.03140489,
    "nested_loop": [
      {
        "table": {
          "table_name": "g",
          "access_type": "index",
          "possible_keys": ["PRIMARY"],
          "key": "idx_group_code",
          "key_length": "387",
          "used_key_parts": ["code"],
          "loops": 1,
          "rows": 2,
          "cost": 0.00693929,
          "filtered": 100,
          "using_index": true
        }
      },
      {
        "table": {
          "table_name": "f",
          "access_type": "ref",
          "possible_keys": ["idx_group_id"],
          "key": "idx_group_id",
          "key_length": "3",
          "used_key_parts": ["group_id"],
          "ref": ["u985510652_ecartify.g.id"],
          "loops": 2,
          "rows": 1,
          "cost": 0.00527872,
          "filtered": 100
        }
      },
      {
        "table": {
          "table_name": "p",
          "access_type": "ref",
          "possible_keys": ["PRIMARY", "idx_group_id"],
          "key": "idx_group_id",
          "key_length": "3",
          "used_key_parts": ["group_id"],
          "ref": ["u985510652_ecartify.g.id"],
          "loops": 2,
          "rows": 8,
          "cost": 0.01918688,
          "filtered": 100,
          "index_condition": "p.product_id in (451454,436557,436005,422676,427654,406498,438920,440047,403424,402161,426357,413770,421856,453293,421836,444708,429476,413127,407471,409966,403355,408795,420652,443583,442532,408975,443876,402463,438541,427151,454935,437239,452456,406327,412758,433230,415021,414349,430686,451899,423535,431133,406624,460023,459938,403250,403839,442555)"
        }
      }
    ]
  }
}